Underlay for printing on paper bags and the like and the process of making same



Man. 27, 1923.

W. J. PIPPERT R BAGS AND TH ON PAPE E LIKE AND THE PROCESS UNDERLAY FOR PRINTING OF MAKING SAME -sheet 1 Filed Apr. ml-

2 Sheets Epifa.

Illy.

ATTORNEYS Man. 27,

W.J. UNDERLAY FOR PRINTING ON PAPER PIPPERT BAGS AND rPHE LIKE AND THE PROCESS OF MAKINGv SAME Filed Apr. 1'?, 1920. 2 sheets-sheet 2 @EMM Patented Mar. 27, l923.

srArEs PATENT Aol-FIcE WILLIS JOHN PIPPEBT, 0F BIDLONVIIILE, MAINE.

UNDERLEY Pon PRINTING on PAPER BAGS AND THE LIKE Ann THE PEocEss or Maxine.

Application filed April `1'?, 1920. Serial No. 374,670.

To @ZZ 'whom t may concern.'

Be it known that l, VILLIsJ'. PirrER'r, a citizen of the German Republic, residing at Ridlonville, in the county of Oxford, State of Maine, have invented certain new and useful lmprovements in Underlays for Printing on Paper Bags and the like and the Processes of Making Same, of which the following is a description.

The invention relates to underlays used in printing upon paper bags, cartons, or the like, which when folded and lying fiat, have a plurality of thicknesses. The purpose of this invention is to form a matrix whereon the bags are to be placed during printing, and which supports the bag at all points, and exposes to the printing mechanism a substantially flat surface support so that the impressions shall be even and equally distinct throughout.

In the drawing, Fig. 1, is a view of that surface of a bag, upon which printing is to be done. Fig. 2 is an edge view from the side of a bag. Fig. 3 is a view of the bag `0n the reverse side, this being a part of the bag which requires support. Fig. 4 shows va bag lying on material from which the matrix is to be formed. Fig. 5 is a longitudinal sec tion on line 5 5 of Fig. 4. Fig. 6 is a plan view of the completed matrix. Fig. 7 is an enlarged longitudinal section of the matrix on the line 7-7 0f Fig. 6. Fig. 8 is an enlarged cross section on the line 8 8 of Fig. 6 with the bag shown thereon. Fig. 9 is an enlarged cross section on the line 9-9 of Fig. 6 with the bag shown thereon.

rFhe invention is adapted for use with any object having varying thicknesses and upon which it is desired to print or impress ch aracters. To describe the process of making.

the underlay and to show its use, it has been illustrated and described in connection with a paper bag of the bellows type having a.

lining therein but may be used with any ar-A ticle of uneven thickness upon which it is desirous of printing.

The paper bag 1 of the bellows type when folded in the usual manner is made up of thicknesses varying from 2 to 21 plys of paper as is well understood in paper bag making. At the bellows position 2 thereof there are 8 thicknesses of paper; at both seams 3 there are nine thicknesses; between the seams 3 at 4 five thicknesses; at 5 six thicknesses; and the portions 6, 7, 8 and 9 have respectively sixteen, fourteen, nineteen and fifteen thicknesses. The variance inthe thicknesses is due to the manner in which the bag is folded `when manufactured. The bag, .when further folded and made ,fiat for the purpose of printing thereon the usual trademarks, decorations and dealers names, has its thicknesses considerably multiplied. The bottom and `partof the lower end of the bag as shown in Fig. 3, is usually folded along the line 10.

The matrix 11 is made from the sheet 12 of unvulcanized rubber, about one-sixteenth of an inch in thickness which has been previously compounded so that it may ultimately be vulcanized. Beneath the sheet 12 a thin `sheet of tissue paper 13 is placed and a second sheet of tissue, 14, is placed over the sheet 12. The tissue sheets are used so that ,the rubber sheet shall not stick to the materials used with itin shaping or forming the matrix. A bag 1 of the kind to be printf ed upon, is placed over the rubber sheet l2 and on top of the tissue sheet 14, with the reverse side (that is the side opposite the side which is ultimately to be printed upon) next to thetissue as shown in Fig. 4. The assembled parts are then placed in a steam heated press and pressure applied to them until the bag 1 has been pressed into the rubber sheet 12 so that it takes the exact outline and shape of the reverse side of the bag. The. press is preferably heated before the asv sembled parts are placed therein. The assembled parts are subjectedto heat for about five minutes, in which time the rubber sheet is vulcanized. lt is, however, not necessary to press thebag 1 into the rubber sheet 12 until their upper surfaces are ush. It is just as expedient if the bag is pressed into the rubber sheet 12 so that it is not quite flush with the upper surface of the rubber sheet, so that in the subsequent use of the as deep as the part 2 Which is 8 ply. All the varying thicknesses of the bag are proportionately deeper according to their varying relative thicknesses. The matrix ll is then placed in a proper printing press and is ready to act as an underlay for printing on paper bags of the same construction as the bag used in forming the matrix. The bag is placed upon the matrix With the corresponding parts of the matrix and bag together, the upper surface of the bagyupon which the printing is to be done, is substantially flat and even and the impression taken from the type or plate Will b e .the same vthroughout Without ghost-lines or imperfect impressions. The matrix forms a'firm bed for printing upon and avoids the great inconveniences heretofore experienced in printing upon paper objects of uneven thicknesses.

Each different type of bag or other article to be printed upon Will require a matrix of its own type.

I. claim:

l. The process of making an underlay for use in printing upon like articles of varying thickness, the steps which consist in placing upon a sheet of substantially fiat.

impressionable material one of the articles to be printed upon, applying pressure to the article and the iinpressionable sheet until the shape and the varying thicknesses of the article are impressed into said sheet and finally permanentizing the sheet so as to retain the impressed shape and varying thicknesses of the article therein, the said impression having a contour shaped to compensate for the uneven thickness of the article and to successively receive said articles in a manner to present exposed surface thereof inan even condition for receiving printing` thereon.

2. The process of making an underlay for use in printing upon articles of uneven thickness, which consists in placing upon an impressionable material one of the articles to .be printed upon, applying pressure to said article to produce an impression thereof in said material, said impression having a contour adapted to compensate for the uneven thickness of the article and to successively receive said articles in a manner to present the exposed surface thereof in an even condition for printing.

8. The process of making an underlay for use in printing upon articles of uneven thickness', which consists in placing upon a sheet of unvulcanized rubber one of the articles to be printed upon, applying pressure to said article in the presence of heat to produce an impression thereof in said sheet of rubber and to thereby form a recess therein having a bottom contour adapted to compensate' for the uneven thickness of.the article Iand to successively receive articles in a manne-r to present the exposed surface thereof in an even condition for printing and retaining the combined article and sheet of rubber in the presence of heat until the latter is vulcanized.

e. The process of making an underlay for use in printing upon paper bags of the bellows type in a folded condition of varying thicknesses, which consists in placing upon a sheet of unvulcanized rubber one of said bags in a foldedf condition, applying pressure to said bag to produce an impression thereof in said sheet or rubber' and to thereby form a recess therein having a bottom contour adapted to compensate for the varying thickness of said bag and to receive successive bags in a manner to prevent the exposed surface thereof in an even condition for printing, and then vulcanicaing the sheet to fix the impression therein.

An underlay for use in printing upon like articles vof varying thickness comprising a sheet of underlay material provided with an impressed recess formed in the substance of the underlay material and depressed in relation to the normal surface of the underlay material, said recess being a substantially permanent impressed facsimile of one of said articles in the underlay material, said material being capable thereafter of supporting other specimens of said articles in the said recess in such a manner so as to present a substantially flat surface for receiving printing impressions.

6. An underlay for use in printing upon paper' bags of varying thicknesses, or like articles, comprising a sheet of yieldable vulcanized rubber, having depressions formed therein corresponding to the varying thicknesses of the article to be printed upon, the varying depths of the depressions being substantially equal to the thicknesses of the corresponding portions of the article, the depressions constituting a recess for the reception of the article to be printed upon and the outer edges of the' depressions constituting a guide for positioning the article` and whereby the article to be printed upon presents an exposed surface in an even condition for receiving printing impressions.

ln Witness whereof l have hereunto set my hand.

lVlLLlS JOHN llPllCl'l.- 

